21112012222031 has 2 divisors, whose sum is σ = 21112012222032. Its totient is φ = 21112012222030.

The previous prime is 21112012222001. The next prime is 21112012222087. The reversal of 21112012222031 is 13022221021112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112012222031 - 2¹⁰ = 21112012221007 is a prime.

It is a super-2 number, since 2×21112012222031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21112012221994 and 21112012222012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112012222001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556006111015 + 10556006111016.

It is an arithmetic number, because the mean of its divisors is an integer number (10556006111016).

Almost surely, 2^{21112012222031} is an apocalyptic number.

21112012222031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112012222031 is an equidigital number, since it uses as much as digits as its factorization.

21112012222031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21112012222031 its reverse (13022221021112), we get a palindrome (34134233243143).

The spelling of 21112012222031 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred twenty-two thousand, thirty-one".